Continuous tube rolling mill



Oct. 2 ,1923. n Re.15692 R. E. BROCK CON'lvNUUS TUBE ROLLING' MH@ Original Filed Sept. l5, 1920 3 Sheets-5heet l R. E. BROCK CONTINUOUSA TUBE ROLLING MILL.

Oct. 2 1923.

original Filed sem. '15, 1920 3 Sheets-Sheet 2 lllllllllflllllm A l www m Maf@ .M

Reissued Oct. 2, 1923.

UNITED STATES Y Re..

PATENT oFFlcE.

RICHARD E. BROCK, F WOOSTEB, OHIO, ASSIGNOR, BY M ESNE ASSIGNMENTS, T0 MACKINTOSH-HEMPHILL COMPANY, 0F PITTSBURGH, PEN'NSYLV'AN'IA.`

CONTINUOUS TUBE ROLLING MILL.

`Original No. 1,420,239, dated June 20, 1922, Serial No. 409,922,'1ed September 13. 1920. Application for reissue med octbber 4, 1922.

'-15 blank is pamed through a series of alined sets of rolls of progressively decreasing pass diameter, known ordinarily as a continuous mill. f For 'reasons not necessary to explain here,

inasmuch as they have absolutely no bearing upon my invention, the pass in these rol-ls 1s not quite round or cylindrical, be`

ing of slight-ly less diameter in a lino trans- .verse to the rolls than-longitudinally therewith, in other words, slightly oval or elliptical in the'longitudinal plane of the rolls.

It is also necessary that the heavier pressure in each succeeding set of rolls be applied at points. in a plane substantially at l v right angles tothe points of heavier,l pressure of the preceding set of rolls. Infother words, the heavier pressure of each succeeding set of rolls should be applied at points 4 substantially 90 degrees away from the 36 points of such heavier pressure of the pres.

ceding s et of rolls.

Furthermore, the passing of the blank through the rolls will, of course, cause elongation ofthe former with the result that 40 the forward end of the blank will travel at a constantly increasing rate of speed and, obviously, each succeeding set of rolls 'must be driven correspondingly faster than the preceding set', the increase, in actual practice 45 being substantially four per cent. My invention provides means for accomplishing the desiredr reductionof the tube, whereby to avoid previously accepted and utilized limitations as to rolland gear diameter and speed, and: for more economical and balanced dlstribution of the power.

With these and other objects in view,

` which will more clearly appear as thev nature serial No. 592,345.

of my invention isrbctter understood, the same consists in the novel construction, coinbination and arrangement of parts as here inafter more fully described. illustrated and claimed.'

A preferred and practical embodiment of my invention is shown in the accompanying drawings, in which: i

FigQl is a top plan view of a mill including two units constructed in accordance with the present invention;

.Fig 2 is an enlarged vertical sectional view illustrating the relative inclination of the individual roll stands or housings of op )osite` roll trains; d `ig. 3 is a diagram illustrating the in'- vention;

v Similar reference lcharacters designate corresponding parts throughout the several figures of the drawings.

As already suggested, it is necessary or preferable in the rolling ot seamless tubes that the heavier pressure of the slightly elliptical roll pass in each succeeding set of rolls be applied at points substantially 90 degrees away from points of such heavier pressure of the preceding set of rolls.

This makes it appropriate to mount or house the alternate sets ot'rolls at subst-antially right angles to each other, .which l.'

do by placing them at opposing,r angles of substantially 45 degreesy rather than horizontal and perpendicular.' See E and E', Fig. 2. s

These rolls are grouped in what may be termed mill units. designated upon the drawings' as A and B, respectively, each unit including a suitable number, las eight sets, of double rolls comprising, two roll trains (C and D inunit A, and C and D in unit B) of four rolls each, designated respectively R1, R3. R5 and R" in train C, and R2, R4, R and RS in train D, unit A, and R9, R11, R1a and R1S `in train C', and R1". R12- R and R16 in train D unit B. See Fig. 3.

As the n iill units A and B (and more it desired) are identical, a'idescription of one will suilice.`

.te already indicated, another object of my invention is to provide a' simple and economical method of progressively in creasing the speed of each succeeding set its of rolls to provide and compensate for the constantly increasing rate'ofspeed of the forward end of the l'ilank hy reason of the elongation resulting'irom the desired reduction ilrsize, 1

Ordinarily.the roll mountings or housings of surh a iuill are set in alinenient. and the necessary progressively increasing rato of Speed is arromplishod through the inediuin of a t-ornmon drivingi shaft running along one sideof tho roll train and carrying driving Spur grt-ara of progressively in creasing diameter. earh meshing with the driven spur on ithindividual roll, This; requires the use of a large nnmhrr of different Sized gears' (sixteen in a 11' roll train illustrated in the pro-'ent rase), whit-h adds very materially. of rourse. to the roet of manufacture, andone o the purpoi-:Qs of my invention to avoid Sur-'h additional ros-ts. To afrfomplih thia. I use a separate or independent driving! shaft for ear-h train.

`designated S. r. S2 and H" for. trains D. C and 1) rrspvk-tively. Seeifig. 3.

Each of Said drivingihat'ls rarrifis a uniforui srt ol) driving!- spur gears of progressively increasing diameter. drsiguatvd respectively, 1. 3. 5 and T onshaft S: E. 4, 6 and H on IQhalt H: Si. 11. 12S-and lion Shaft S2: and 1H, 12. 1-1 and 1G on shaftY di". As ahove stated. these seta of spill' drivin#r gears are oli uniform diameter. that ia to Say, spurs i, Q, S1 and tl artl ol1 thtl same, diameter; 3, 4. 11 and 12 aro/ot thel same diameter: (3. 15% aud 1-'1 aril of thv same diameter; and T. H. l5 and lt' are ol' ilu` Saint'l`l` diameter.

Thilo not hiringr lhrorrtiralliY rorrwt. it. will he .'-iufliriently tir-rural(L lor all pui-powa of desrription and iliutration. to Say that,

Spur i is right per rent. lai-for than spur 1; spur 5 is eight, per (tent, largrr than spur il: and .spur T is eight per wut lar-grr than lspur 5. i

For the purport: of illustration. we will say that shaft S is driven revolutions per minute and shalt Si ll-l rvvolutiona por minute. Spurs 1. fl. 5 and 7 on shaft. S

l 'will drive pairs of rollsV R1, Ri. its and [t7 rcspnfrtivvly, whilo Spurs 2, 4. (tand H ou shaft S- will driw` pain-` of rollall. lll. lt is obvious that witlrthis arrangement. lupur 2 on Shaft S. whirh is of the saine :,Iianirter as Spur l ou :diaft H liut travel:-y '1 per Cont faster. .will iulrive pairs ol rolls R2 four per cent faster' Jhan pairs ojl rollsl VR1 are driven:5pur 3 on shaft `which is eight por `zent larger than spur 2 hut travels four per cent slower. will drive pairs of rollz` R" four per cent. FaS-tm* than pairs of rolls 'H2 are driven; spur -t ou shaft. SH whirh is the Sana; size-as spur il hut travels four ner ront faster. will drin pairs ot' roll# l" four prr rent, fastrrtlriu pairs ol' rolls l aro driven; rspur 5 on shaft,

.hut travels four per cent slower. will drive pairs of rolls` R7 four per ront faster than pairs of rolls-R? are driven; while spur 8 on shaft H1. which is the Same size as Spur 7 hut travels four per rent faster` will drive pairs of rolls l four per cent` fan-ter than pairs `of rolls RT are driven.

It will he apparent that, in order to maintain this uniform progressively increasing rate of Spend of the pairs` of rolls throughout unit Il. rolls: R9 must he driven thirtytwo per cent; faster than pairs of rolls R1. Consequently. as Spur S) on shaft Hf' is of the rame .sr/:e as spur 1A on shaft SivitV `will he 'neresaary to drive shaft S2 thirty-twotper shaft Sl is drivennfour per oentfaster than lt is ohvious that. any numhenofmiil units maiy ha included in va fjompletedmill. the driving shafts of each succeeding unitheingdrivr-n fniptionately fasterthan those of tho prut; lin; aait. in Vorder that. they. may dotheir work with the same uniform .wt of driving Spurs. -l l.

The motor M, .with itseommon driving shaft 23d-. (-,arijving'l gears 2H vvand Q9, furnishes tho motivo power for 'the 'Your Shafts Si. p1', S2 and SL'the first being driven through gears 24.. 23 and 22,. the'isecond through `gears '27. t andf 25, the-third through gears; 33..,32`and fil. and the-fourth through pears 'lt. 35 and 34.l .Pinions 28,

:39. iutorvuniiug between 4gears 24,433'Qand 2T. Ii. respectively, provide for anyypractit-ahhdistrhution of power to the several shal't: and trains without ex'eeaqive variation in ,gear diameters or speeds. Seedigs. l and Il. L

What: l rlaim is:

1. ln` a routiniioub" tube' rollin@ millwa. mi!! x'i'n'itjinrluding a plurality of roll stands rarryiugpass forming rolls,'sep:ui1` e vd/...viiug #halts rrpeetivrlf,"at:opposite Sidewnf tho roll. positions,7 gearing fbetiv'een farli shatand the rollaof alternate rfll "stands, the -aaid gearing including'a gear setffior earh roll stand, and the eorreiipondin;4 gn' seta at, oppositelidesoltheI imit i'nti ing" gears ofuuiformqsize, and meaisffor'driving' one, offfiaid driving Shafts fa uur thtI other.

231113' roi'itiuuous tullio i'rollingffmiil, lil.v mill unit. inill'iuliugja pluralityr of rolfliit'a' llt) ' ing-shafts respectively pass forming rolls, separate drivat opposite sides o f ositions. u series of uniform wearcarrying the roll ing sets eti'veen each shaft and the rolls of alternate roll stands, the said gearing lsets of each shaft having a progressive speed ratio. and means for 'drvingone o f said shafts faster thanv the other.

3. I ,n a continuous tube rolling mill. a plurality of mill units each of which includes a plurality` of roll stands carrying;r pass forming rolls. separate drivingA shafts respectively at opposite sides of the roll positions, gearing between each shaft and thev rolls of alternate 'roll stands, said gearing having a ratio to progressively increase the speed of successive rolls. and a common source of lpower havingdriving connect-ions with the 'said driving shaftsand providing means for operating the two shafts of each `mill unit at different speeds. and also driving thetwo shafts of one mill unit faster than the shafts of the immediately preceding` unit.

4. Ina continuous tube rolling mill. a series of mill units havingthe rolls of individual roll stands arranged in al'inement ment to produce a continuous 'passand the tio f meins.

to provide a continuous roll pass, opposite gear trains in each unit includingl opposite shafts ,sets of driving'lgears of uniformly increasing diameter on each Shaft and operatively :connected with the rolls of alternate ro l sets, a source of power common to the several mill units,- andconnectious'hetween the source of power andthe shafts of each unit forrotati'ng the shaft located al ternately at opposite sides ofi-the mili at uniformly increasing rates of speed. a

. 5. n a continuous tube rol 'ing niill` a plurality of mill units having` the .rolls of the individual roll standsarranged in alinesaid units including opposite shafts, correspendingl sets of gears of-iiniformly increas- :ing diameter carried by said shafts` and driving 'connections' between the -gears of the opposite shafts and the rolls of alternate roll stands. means forrotat'ing the o posite shafts at alternate sides of the miil at. a uniformly advanced. rate of speed, and a common source of power for'actuating' said means,

6. In a Acontinuous tube-rolling mill. a.

f mill unit including a plurality of roll st ands, rolls in each stand forming a roll pass, separate shafts at each sideof theypass formed by the' rolls ofthe roll stands, gears Aof progressivelyand uniformly increasing diameter arranged on said shafts and located opposite alternate roll stands, drivin connections between vsaid rolls and saidi gears, means for driving one of said shafts'at a faster rate of speed than the other, and a common source of power for actuating said 7. In acontinuous/tube rolling mill,A a mill unit including a `plurality of alter 'nately arranged roll stands carrying pass forming rolls, separate driving shafts at opposite sides of the roll' positions` pairs of Inears between said shafts and each roil stand, and apower shaft having a differently proportionet with each of said driving,y shafts. .A s

8. In a continuous tube rolling milla plurality of alternately arranged pairs of rolls having corresponding oppositely eirten'ding roll shafts, pairs of main outermost driving shafts therefor and means for driv# ing 'thciii together. and pairs ofditi'crentiy proportioned gears between the outermost shafts land the several roil shafts for transmitting power to the roiis at successively increasing speeds.

9. In a continuons tube rolling mill, a plurality of. alternately arranged pairs of rolls having corresponding oppositeiy extending roll shafts, pairs of main nutenv most driving shafts therefor and means for driving each shaft of each pair at different;

speeds, and pairs ofdiiferently proportioned gears between-the outermost shafts and the several roll shafts'for tfransinitting.Y power to the rolls at successively ineieasii'ig speeds,

Ameans connecting said shafts at each side `with each other, and ivi-th a prime mover7 and differently proportioned gearing connecting 'said shafts with the roll shafts.

12. ln a continuous" tube roliing mill, a

,plurality of alternately arranged pairs of rolls havin);r corresponding oppositely ext`eiidin,f r roll shafts` pairs of main otite'rmosti driving;l shafts' therefor in axial alinement and means for driving them vat diiferent, speeds from a common prime` mover, and

successively graduated differently proportioned pairs of gears between 'the outermost'. shafts and the roll shafts' for transmitting Apower to the roils at suci'es'siveiy increasing speeds. y l

13. In a continuous tube rolling mill, a piiiraiity of pairs of rolls in pass alinement having alternating oppositely arranged pinion and gear connection of alternately arranged pairs of,

iis

14, In a continuous tube rolling mill. a.' plurality of pairs of rolls-in pass aline-` ment having;r alternating roll shafts'disposed in substantially equal angular ar- V ranjizenient at each side wherehyto provide a successive series of opposing roll"treat ments to the hlank, pairs of main outermost drivinggshafts therefor' in axial alinement. gearing for driving the, outermost shafts at differently proportioned speeds .from a prime turnover, and pairs ofk gears substantially equal angular arrangement at,

each side whereby to provide a successive series of lopposing roll treatments to the blank, pairs 0f main outermost. driving shafts therefor in axial alinement, gearing for driving.l the outermost; shafts from a prime'mover, and pairs of differently proportioned Pfears @Amma-ting the outermost shafts with the roll shafts whereby to drive the several pairs of rolls at successively increasing: speeds. f y

n testimony whereof I affix my signature.

- RICHARD E; BROCK. 

